Can I fade in a background image (CSS: background-image) with jQuery?

i have been searching for ages and finally i put everything together to find my solution. Folks say, you cannot fade-in/-out the background-image- id of the html-background. Thats definitely wrong as you can figure out by implementing the below mentioned demo

CSS:

html, body

height: 100%;   /* ges Hoehe der Seite -> weitere Hoehenangaben werden relativ hierzu ausgewertet */
overflow: hidden;   /*  hide scrollbars */
opacity: 1.0;
-webkit-transition: background 1.5s linear;
-moz-transition: background 1.5s linear;
-o-transition: background 1.5s linear;
-ms-transition: background 1.5s linear;
transition: background 1.5s linear;

Changing body's background-image can now easily be done using JavaScript:

switch (dummy)

case 1:

$(document.body).css({"background-image": "url("+URL_of_pic_One+")"});
waitAWhile();

case 2:
$(document.body).css({"background-image": "url("+URL_of_pic_Two+")"});
waitAWhile();

This is what worked for my, and its pure css

css

html {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
  }

  body {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
  }

  #bg {
    width: 100%;
    height: 100%;
    background: url('/image.jpg/') no-repeat center center fixed;

    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;

    -webkit-animation: myfirst 5s ; /* Chrome, Safari, Opera */
    animation: myfirst 5s ;
  }

  /* Chrome, Safari, Opera */
  @-webkit-keyframes myfirst {
    from {opacity: 0.2;}
    to {opacity: 1;}
  }

  /* Standard syntax */
  @keyframes myfirst {
    from {opacity: 0.2;}
    to {opacity: 1;}
  }

html

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
  <div id="bg">
    <!-- content here -->
  </div> <!-- end bg -->
</body>
</html>

Can I fade in a background image (CSS: background-image) with jQuery?

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